87811 has 2 divisors, whose sum is σ = 87812. Its totient is φ = 87810.

The previous prime is 87803. The next prime is 87833. The reversal of 87811 is 11878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87811 - 2³ = 87803 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (87881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43905 + 43906.

It is an arithmetic number, because the mean of its divisors is an integer number (43906).

2⁸⁷⁸¹¹ is an apocalyptic number.

87811 is a deficient number, since it is larger than the sum of its proper divisors (1).

87811 is an equidigital number, since it uses as much as digits as its factorization.

87811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 448, while the sum is 25.

The square root of 87811 is about 296.3292088202. The cubic root of 87811 is about 44.4477356359.

It can be divided in two parts, 87 and 811, that added together give a palindrome (898).

The spelling of 87811 in words is "eighty-seven thousand, eight hundred eleven".